Physical constraints from near-infrared fast photometry of the black-hole transient GX 339-4
| Autor: | Vincentelli, F. M., Casella, P., Petrucci, P., Maccarone, T., Russell, D., Uttley, P., De Marco, B., Fender, R., Gandhi, P., Malzac, J., O'Brien, K., Tomsick, J. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/ab5860 |
| Popis: | We present results from the first multi-epoch X-ray/IR fast-photometry campaign on the black-hole transient GX 339--4, during its 2015 outburst decay. We studied the evolution of the power spectral densities finding strong differences between the two bands. The X-ray power spectral density follows standard patterns of evolution, plausibly reflecting changes in the accretion flow. The IR power spectral density instead evolves very slowly, with a high-frequency break consistent with remaining constant at $0.63 \pm 0.03$ Hz throughout the campaign. We discuss this result in the context of the currently available models for the IR emission in black-hole transients. While all models will need to be tested quantitatively against this unexpected constraint, we show that an IR emitting relativistic jet which filters out the short-timescales fluctuations injected from the accretion inflow appears as the most plausible scenario. Comment: Accepted for publication in ApJ Letter. 9 pages, 3 figures |
| Databáze: | arXiv |
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